Ideally, you'd have to find a dealer that sells a processor or receiver with XT32 and that also happens to have the older model of that same gear with XT from his used gear lot. Now if that dealer were to be kind and patient enough to setup a system with the XT gear and do the calibration, then allow you to listen to a few tracks and then insert the XT32 gear in place of the XT, that would be the best possible comparison. But in practice, finding a dealer with the necessary gear and the extra-ordinary patience and willingness to perform those tests is highly improbable.